Work is going on to incorporate all applicable fixincludes fixes into
the Solaris headers proper. One fix is currently problematic since it
uses an G++-internal macro (__GXX_EXPERIMENTAL_CXX0X__) where libstdc++
<cmath> already switched to testing __cplusplus. The following patch
updates the fix to match <cmath>.
Tested by mainline bootstraps on i386-pc-solaris2.11,
sparc-sun-solaris2.11 and 4.8 bootstrap on i386-pc-solaris2.10.
Ok for mainline and 4.8 branch if they pass?